US 11,876,496 B2
Differential input circuits with input voltage protection
Vadim Valerievich Ivanov, Tucson, AZ (US); and Srinivas Kumar Pulijala, Tucson, AZ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Jul. 28, 2021, as Appl. No. 17/386,979.
Prior Publication US 2023/0034632 A1, Feb. 2, 2023
Int. Cl. H03F 3/45 (2006.01); H03F 1/52 (2006.01)
CPC H03F 3/45179 (2013.01) [H03F 1/52 (2013.01); H03F 2200/426 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A differential input circuit, comprising:
a first input voltage protection transistor having a control terminal and a first input terminal of the differential input circuit;
a second input voltage protection transistor having a control terminal and a second input terminal of the differential input circuit;
a first input transistor having a control terminal coupled to the first input voltage protection transistor by a first current path;
a second input transistor having a control terminal coupled to the second input voltage protection transistor by a second current path;
a control terminal drive voltage source coupled to the control terminals of the first and second input protection transistors;
a first feedback path coupled to the control terminal of the first input voltage protection transistor; and
a second feedback path coupled to the control terminal of the second voltage protection transistor.